Your baby's digestive system is developing and by now can absorb some nutrients such as sugars, which are found in the amniotic fluid inside the womb. However, your baby continues to get almost all food from mum, through the placenta.
Insomnia can be a common problem in pregnancy, especially if your baby is keeping you awake at night with kicks and movements. You might also wake up with cramps or need to urinate more often during the night. Try adjusting your sleeping position to allow for your bump and relaxing in a warm bath or having a milky drink before bed. Exercise during the day can also help with sleeplessness.
As your bump grows you may need to change the way you exercise. Gentle water aerobics or aqua-natal classes are ideal, helping you to slightly raise your heart rate while being supported by the water. Even if you think your bump is obvious, it's still worth telling your instructor's that you're pregnant, especially if you're not attending a special antenatal class.